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Determining Ethnicity skull
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Definitions Nasal index – the ratio W/L (opening)
Nasal spine – located at the base of the nasal cavity Nasal silling or guttering – on the base of the nasal cavity; there will be sharp ridges (nasal silling), rounded ridges or no ridges (nasal guttering) Prognathism – extended jaw
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Caucasian Nasal Index Longer and more narrow
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Negroid Nasal Index Shorter and wider
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Mongoloid Nasal Index Moderate; variable
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Nasal Spines Caucasian African Asian
Caucasian – usually prominent spine African – usually small spine Asian – usually somewhat prominent spine
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Nasal Silling and Guttering
Caucasian African Asian Caucasian – silling (sharp ridges) African – guttering (smooth at base) Asian – rounded edges
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Prognathism Caucasian African Asian Caucasian – straight
African – prognathic Asian – varies
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Eye Orbital Shape Caucasian (top left) – round; somewhat square
Negroid (bottom left) – rectangular or square Mongoloid (top right) – rounded; somewhat circular
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Overall Skull Shape Negroid – shorter and wider
Mongoloid– shorter and broad Caucasian – longer and more narrow
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